1387835805 has 16 divisors (see below), whose sum is σ = 2221000704. Its totient is φ = 740024640.

The previous prime is 1387835797. The next prime is 1387835809. The reversal of 1387835805 is 5085387831.

It is a happy number.

It is not a de Polignac number, because 1387835805 - 2³ = 1387835797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387835809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127227 + ... + 137703.

It is an arithmetic number, because the mean of its divisors is an integer number (138812544).

Almost surely, 2^1387835805 is an apocalyptic number.

1387835805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1387835805 is a deficient number, since it is larger than the sum of its proper divisors (833164899).

1387835805 is a wasteful number, since it uses less digits than its factorization.

1387835805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19316.

The product of its (nonzero) digits is 806400, while the sum is 48.

The square root of 1387835805 is about 37253.6683428626. The cubic root of 1387835805 is about 1115.4395245489.

The spelling of 1387835805 in words is "one billion, three hundred eighty-seven million, eight hundred thirty-five thousand, eight hundred five".